我想设置一个UILabel的左插图/边距,但找不到这样做的方法。标签有一个背景集,所以仅仅改变它的原点是行不通的。这将是理想的插入文本10px左右在左手边。
当前回答
为UILabel添加填充的最佳方法是子类化UILabel并添加一个edgeInsets属性。然后设置所需的插图,标签将相应地绘制。
OSLabel.h
#import <UIKit/UIKit.h>
@interface OSLabel : UILabel
@property (nonatomic, assign) UIEdgeInsets edgeInsets;
@end
OSLabel.m
#import "OSLabel.h"
@implementation OSLabel
- (id)initWithFrame:(CGRect)frame{
self = [super initWithFrame:frame];
if (self) {
self.edgeInsets = UIEdgeInsetsMake(0, 0, 0, 0);
}
return self;
}
- (void)drawTextInRect:(CGRect)rect {
[super drawTextInRect:UIEdgeInsetsInsetRect(rect, self.edgeInsets)];
}
- (CGSize)intrinsicContentSize
{
CGSize size = [super intrinsicContentSize];
size.width += self.edgeInsets.left + self.edgeInsets.right;
size.height += self.edgeInsets.top + self.edgeInsets.bottom;
return size;
}
@end
其他回答
我通过子类化UILabel和重写drawTextInRect来解决这个问题:
- (void)drawTextInRect:(CGRect)rect {
UIEdgeInsets insets = {0, 5, 0, 5};
[super drawTextInRect:UIEdgeInsetsInsetRect(rect, insets)];
}
斯威夫特3.1:
override func drawText(in rect: CGRect) {
let insets = UIEdgeInsets.init(top: 0, left: 5, bottom: 0, right: 5)
super.drawText(in: UIEdgeInsetsInsetRect(rect, insets))
}
斯威夫特4.2.1:准备
override func drawText(in rect: CGRect) {
let insets = UIEdgeInsets(top: 0, left: 5, bottom: 0, right: 5)
super.drawText(in: rect.inset(by: insets))
}
你可能已经猜到了,这是对tc的改编。的答案。它有两个优点:
没有必要通过发送sizeToFit消息来触发它 它只保留标签框架——如果你的标签有背景,而你不想让它缩小,这很方便
编辑:这个真的很老了。上面有更好的解决方案。
我最终只是在文本中添加了一些空格:
self.titleLabel.text = [NSString stringWithFormat:@" %@", self.titleLabel.text];
丑陋但有效,不需要子类化。
你也可以试试“\t”。对于一般的解决方案,请参考已接受的答案
如果以编程方式创建标签,则可以使用sizeThatFits方法计算填充。如果使用多行,文本将以最大宽度值换行。
let text = UILabel()
let padding = 10
text.layer.cornerRadius = 5
text.layer.masksToBounds = true
text.text = "Hello"
text.font = UIFont(name: text.font.fontName, size: 18)
text.textAlignment = NSTextAlignment.center
text.numberOfLines = 1
let maxSize = CGSize(width: 100, height: 100)
var size = text.sizeThatFits(maxSize)
size.width = size.width + padding * 2
size.height = size.height + padding * 2
text.frame = CGRect(origin: CGPoint(x: 0, y: 0), size: size)
和@IBDesignable,使其与接口生成器一起工作
斯威夫特4
//
// PaddedLabel.swift
// TrainCentric
//
// Created by Arsonik
// https://stackoverflow.com/a/33244365/337934
//
import UIKit
@IBDesignable
class PaddedLabel: UILabel {
@IBInspectable var inset:CGSize = CGSize(width: 0, height: 0)
var padding: UIEdgeInsets {
var hasText:Bool = false
if let t = self.text?.count, t > 0 {
hasText = true
}
else if let t = attributedText?.length, t > 0 {
hasText = true
}
return hasText ? UIEdgeInsets(top: inset.height, left: inset.width, bottom: inset.height, right: inset.width) : UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
}
override func drawText(in rect: CGRect) {
super.drawText(in: rect.inset(by: padding))
}
override var intrinsicContentSize: CGSize {
let superContentSize = super.intrinsicContentSize
let p = padding
let width = superContentSize.width + p.left + p.right
let heigth = superContentSize.height + p.top + p.bottom
return CGSize(width: width, height: heigth)
}
override func sizeThatFits(_ size: CGSize) -> CGSize {
let superSizeThatFits = super.sizeThatFits(size)
let p = padding
let width = superSizeThatFits.width + p.left + p.right
let heigth = superSizeThatFits.height + p.top + p.bottom
return CGSize(width: width, height: heigth)
}
}
斯威夫特2
@IBDesignable
class PaddedLabel: UILabel {
@IBInspectable var inset:CGSize = CGSize(width: 0, height: 0)
var padding: UIEdgeInsets {
var hasText:Bool = false
if let t = text?.length where t > 0 {
hasText = true
}
else if let t = attributedText?.length where t > 0 {
hasText = true
}
return hasText ? UIEdgeInsets(top: inset.height, left: inset.width, bottom: inset.height, right: inset.width) : UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
}
override func drawTextInRect(rect: CGRect) {
super.drawTextInRect(UIEdgeInsetsInsetRect(rect, padding))
}
override func intrinsicContentSize() -> CGSize {
let superContentSize = super.intrinsicContentSize()
let p = padding
let width = superContentSize.width + p.left + p.right
let heigth = superContentSize.height + p.top + p.bottom
return CGSize(width: width, height: heigth)
}
override func sizeThatFits(size: CGSize) -> CGSize {
let superSizeThatFits = super.sizeThatFits(size)
let p = padding
let width = superSizeThatFits.width + p.left + p.right
let heigth = superSizeThatFits.height + p.top + p.bottom
return CGSize(width: width, height: heigth)
}
}
如果你在ios6 +中使用自动布局,你可以通过在UILabel的子类中调整intrinsicContentSize来实现。
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
self.textAlignment = NSTextAlignmentRight;
}
return self;
}
- (CGSize)intrinsicContentSize
{
CGSize size = [super intrinsicContentSize];
return CGSizeMake(size.width + 10.0, size.height);
}
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